SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56d75a69349dfc326846095098c8bf8910fc37e7afbddefd44367a67ca6f2cdb' 
  AND token = 'g1kr9J5kRjm+P1hYEOoK0iEIePVvzBwCzKmbwxJ0giM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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