SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20ea525931e9d4abf495f15764deb107366de35ef50ca58949b10e0354337fad' 
  AND token = 'VJYDBohupdTYb6+HP0N8K+A8hJXLUgpQItV2ulioim4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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