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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2bff47b8b51da78cb860b69a5b91791dd4f694c18a9e295181d4b473f20252a' 
  AND token = 'ckQU9V4RJITqek0Oe+FCzc4a4S5zSdW6w7yY4C7FPVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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