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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee531ea151eb89440d877da0578133963035a5f27a83efb04fce83eb79b92f1b' 
  AND token = 'tMRsQMK0LnmVd3zWkhpCh0uU7zcxJYXj++R9DD6pO1c=' 
  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"
    }
  }
}