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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2a803b3cc1a5fe6083daed72d3af4b8a06b976d18610b5190bfdf2550084b0e' 
  AND token = 'p64aWQw2UmyPK7ZdGPsuf8WcJ0QT01aAQFpBsujojPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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