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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16a4d8d97c9de36de412c14c17c0ac02903b16d6d78bb9157bbf45467c687bae' 
  AND token = 'lssPVC4rpvmttkUkr7qePFoDM1BBG3Wq0ZogxRpJHN0=' 
  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"
    }
  }
}