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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f13012b60cb88cc6eeafcaacad00a1c409b2ac5f4b8627d7f4cceae61878b4' 
  AND token = 'H5WPSbSLY6uB8x4tMOaP8U4BMuW12kiyuJbVfXjUKFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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