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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ead01caeea54333aedc24c1b99e012cdc41d49bc25e51e75adc42ffb29c25cf7' 
  AND token = 'V2j72g7Djzi3n3AuKYCLfYJJAMI6o1Feub0GNWAXw9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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