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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb7ff1e395ca0c6b7c7f057c5af387800d67c76d05ecb026eb45700fefd20b77' 
  AND token = '+VfM/kI0lkKjuTn9EkjPxy/5VzpmuIDLCkRJuop2hD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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