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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bae3479b6650736f9cd06e50c6dd6aa499c06e3df726d5a9a11d36c116fd70e' 
  AND token = 'sDICOkJwt0A3CIe2PCe+DQ4ceDGeZyWH0ybnLGjTsDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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