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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c8d18e7a9776326a77dbab0300c0ee43952d8502f0337d1b1989d27ff83b813' 
  AND token = 'zdOB+CCLrOWSEXHHlCBP6o9YKztFPlUbyQIxNTmn1OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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