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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7d302f7333dcaf570e5b4a03d84f6ede4832a273986c94d13e3c008a7a46d9' 
  AND token = 'mYDsexLvSk4UVWwGJSoqo5oCpdicf/9MOmgH6i4dlSk=' 
  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"
    }
  }
}