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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46e12834047ffac9605d303ad6095ef092edb8d8b347f9e18395a703db26a2bc' 
  AND token = '9nnzZ3ZynEombgRxZcTQe5NQd45hmz0ihd4zztcrrds=' 
  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"
    }
  }
}