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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd72b15670014d726ba4df8a4c72edbd7c0f643e5d618c7af6230c1ecf88ed5d5' 
  AND token = 'CK90FYXrgOkmdkj6t/D96oNddBhgDs3CASJ6pqRGNnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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