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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25ebe9bfc4e43fac81c1599382240b8aa3fad4ed834b0100daae4628184cef8d' 
  AND token = 'bqcGJou03AxtgXl0ntajZ61wO+rhnUlpgN5+/d9ceQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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