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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '126bd6f09a98d7a9f528d1702a84b10c71617c3427e9a4b5302917097659319b' 
  AND token = '979G7SmM/AiLBO6ygKCRb/Qhy4nyR99eRL8oEOQyQxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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