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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2ba8e35aacfb6440273c967eecb4ccae89eabc226da0eee8907ab68e67b4ef9' 
  AND token = 'MfXoZkuSgYxOA1vTygKxtvf8llAS0n/Loc+/z7YzsLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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