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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d349b3108f6770c14a4e802533d2a05c7e440f597ae717789e79cee7ee2874a' 
  AND token = 'PmmRa3PjKsm0KgNqTmtDBjjuMxrDs+NKq6y2UeAZafA=' 
  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"
    }
  }
}