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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd47d7866d52abe3706bda2e4fc23e96f400bb9f656f21f758862b002302b753d' 
  AND token = 'ffgMyDdEB+OHcWn82l+fJaLAEdaZW7dTyqjJpCYlsIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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