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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'affb715481893281012c3b5df3cee5e5d45b43acaacb389e63376322bd5afef4' 
  AND token = 'aJMw0g2S6/Qcil/MI4jvk4Al1cJNI7WQkhssuhbhKNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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