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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ca3d366be9c1c52d2fefc5975861b353c52c0bc601dc2073b22527950ca206c' 
  AND token = 'p3bj0rdAfE0IlV4w9vVoaeZOaTzNwUPwT6pQ5897EfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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