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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7db71ba920060c9f28c333b3acd7076313cbe8365c2de2531e85de53421be84b' 
  AND token = 'IhkQUpGiMQykkCEMOMuZuGLzY66Uag2JanwLj6wYvNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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