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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59f8700c0b12d7d29aedde8ba00c1b8e9b97e177204ffd80f0d153d80b7685d3' 
  AND token = 'iod/QyHIGUoNE9PSe8g01bENZd92LcU0R2UW1j/VAG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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