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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '318c9555d6a4163325ee054b9b9ce2f61ac0622f9c3d52e3ad8f89979da16ca0' 
  AND token = 'B56A9+BtjtIG9F2gjX2M/XoGWpYEunp/iOW0b11e3Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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