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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66b861dad3563862fe94de4a3c6853efd88cf5279127ce277d13ffeb2c12f1a8' 
  AND token = 'TSks8stq2IeKjWfod+e065fIoqvmsOqas4oUGmmaB+k=' 
  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"
    }
  }
}