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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c4fa57f0a091688787c65c73dd418306fc56766d1f7bdaebd920b14be6c4adc' 
  AND token = 'lR+px2CU4PM/d+gk/rGw1+qfNToK2I80nlHFs4J89EU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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