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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10e5278c03b598e6534aafa94d6a336f53e6f37027c09debaa34f9a3972cab34' 
  AND token = 'ljm8YKkRNEm4EMPnztH6dm7urhGrlEAknYExkGx4KJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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