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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c96a08d1f1ed494baa9699758b67a1748652bb8fb0d382e55fb6b543e31156ad' 
  AND token = 'XbmFHEKqE0yI63ASjTNmk/DM0bolw6m7SYjJvNJLI8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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