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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '600ce2677cb6f0e59e41dc86f8970610671f6527250e47fbbd407fb0db02d23b' 
  AND token = 'pmw1XHbWe8czqvWfCAR23AAnIoNxLBjl65R5qrwJISU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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