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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce9a6375cd6316938468ccaee013b6cbdf7380c265a76b4acb77244c6178102' 
  AND token = 'xu9hZxv9mPq9m5goEmGHfOZmUp0F82ehk92vE2m4qWM=' 
  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"
    }
  }
}