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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c092e462bd39852d75920546cbd9491e04038d93e13f3cddc2fe65e1a58f6c92' 
  AND token = 'xfjh6XLSaah4WfMGuy3ApDkNq1Ss+fNU7fQpthJIM0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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