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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f269e80b5f04a5ffb8b45d1164535083ee5d444263b96b2efebd49773f19dae9' 
  AND token = 'FRTUU18OJGnSArMFyQNOBf+9MNhB6bCmr3j5aeujius=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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