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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fb9eb5cb0e861fd4e689d26ab579233238562d22d3cb0c66bf69e2b8c270426' 
  AND token = 'UeHca48aImHQQLh745Q6MDLs/euUaGVif345pIKml7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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