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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba2e81b0e24a25c0898d450b2d3b37cd4e80be5c80e5b863a568113339c47532' 
  AND token = 'FAakQcL/lkYN+nn0yESuag2UxJxJ8CUvPnbtQbgbet8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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