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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '171673a077e0ee8e6f236b9be99209aa85862b1c8bd3fbbe59a5e578a2b6c625' 
  AND token = 'ZuRRojteoBBeeRgHUUb+loUJ2GYAB5P6VoiyyAN7gzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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