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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ad56578c878a795a1fbd4238e80ee8ac731a90128af9f040bc9ac99872a7893' 
  AND token = 'y/+qKayboiM1S90s0J8tcKXIwHayV823xlc6c0q6eow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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