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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '602e0e5ddbd5b2c66b8ca06e10683f94fa56a4f55a75f02ed188159427676660' 
  AND token = 'B4pvhEvsHIGi2z1T9iFUr0Ux8VatayhzegV6aKZkCwo=' 
  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"
    }
  }
}