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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e8d094acdddead180afb54af290eb246483e62ee4512d9fbfea8157c588c227' 
  AND token = 'W3o93WOU4kVMNJKCB+yFlPOUkI6UsmXLSqLvA6+9yio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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