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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f024c98a72f51a789c22b3ff74cff0f7854bb4226929f15ea5d1ccd78f9104c' 
  AND token = 'OpTsDT0VUMI92YYqiSkmx9uj/J6NXwqWFeTW6AwE5gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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