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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ceeb50e6f12bae5c47b7aa0c5a090c7593af4af9198b99f8c85c32a030996e3' 
  AND token = 'gCTv2l+UdNXWBQCFyyE5Hl7GGpCg5y/34tx0huxXe8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}