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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d48f758fb785a539ce4a42a5d0d0277bbf44b9d2d70a1c65d7e6e1d91febe1a' 
  AND token = '27ydMFBI3OT2NXgvTfKvQWhWelUk4M+72cePNlZyy/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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