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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7807a648950338f8f725a820f57865e7144e6508fd7110e50b232362c1841d63' 
  AND token = 'VZq8OSkX7+aMczt7y2QrX/KMj6c1eNnDMONvHkif6fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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