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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238d1c5a7d27ed6fb97d0204d1a39cb0a49d03f655ebb4f2ccbbc9b95386c4e4' 
  AND token = '/FtJu8NeFFm10EF+jwp9RSS9WscNCDVuqpl8dGBpmfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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