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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f09f1a4c9b091f68bf3c67337c7dc3ce3cd4ccb33d788cc515df4c640f3e358f' 
  AND token = 'kXKBewx0eat2UVcOL1zgaBrE4IE0YLcob9rhoD7HP18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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