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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c85b02e66851e491b448752ae56052f1759004c672f68b90c9bea4ba4f092d08' 
  AND token = 'x9HyPepfDdhUOrbIcM4kFRCHb1Ykd2stswyl81Wd/zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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