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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '231c6cbd473f5856eeacdde6f85c8336605429b48951523d9ff62b6568da1a8d' 
  AND token = 'nL4efnETFGiYph9ug8ZyFvhOoVQK8+ZYc5puMg+iX5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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