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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32dba780adb636337614623ad05323883ab54b00ceb5fb311e21899184557fd9' 
  AND token = '3cGWjDo8w7Bx7NLptEtsINAosyVefYLI04hEu7/9PSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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