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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '298104f2f32ec6a61f29286438795ababa865747623ee20eb520288abda8b58e' 
  AND token = '+2wlR3r+AVnqjmR7h+R4jBt+BcafhUgySOC8r1Xhsmc=' 
  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"
    }
  }
}